CMS Brusilov ("The Surgeon / The Comeback Kid") was a Sovereign Colonies ship orbitingTau Volantis. To keep the research operation safe, the Brusilov was deployed to watch over the fleet, specializing in long-range detection of incoming ships. It was equipped with a missile system and large mass cannons for close-range combat as well as a system that it used to deploy space mines. Aside from the weaponry, the Brusilov had crew accommodations that are significantly less comfortable than those found on the other ships. The ship was designed to operate solely in deep space.

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The CMS Brusilov was the ship where the first Co-Op mission in the game took place. It was out of the way and there are no mission activation places for the Co-Op mission until the players decided to go there themselves which Carver will receive a transmission from his son, Dylan Carver and requested to check out the ship. Upon entering the ship, Isaac and Carver faced a problem. The Brusilov lacked air so they need to restore the life support to properly explore the ship. Upon returning the life support to the Brusilov, Carver heard another transmission from Dylan who sounded terrified. Carver was determined to find out where the transmission originated from.

Upon reaching a deeper section of the ship, they both reached a room with a Marker that had cords running into it, indicating that the crew was running tests on it before the Scenario Five cleanse order. Carver saw a toy soldier near the Marker and approached it, but Isaac told him to stay away from the Marker, not noticing the soldier. Carver told him not to worry and he picked up the soldier and heard an eerie voice telling him, "Why did you do it?" and the Marker glowed red. It is then revealed to the players that Carver was being affected by dementia from the Marker. Isaac snapped Carver out of the trance as the Necromorphs swarmed the room.

After killing all of the enemies, the players will find a storage container filled with a number of tool parts and resources as a reward for completing the mission. Upon exiting the room to leave the Brusilov, the life support systems are cut off by the Necromorphs which gave the players a time limit to get off the ship before they suffocate. Upon leaving the ship, Isaac figured out that the Marker showed Carver something and asked him what he saw. Carver denied the assumption and told Isaac to forget what happened in the Brusilov and focus on getting to the planet to which Isaac agreed.

You will have access to this optional mission during chapter 4 and then again during chapter 7. To reach the mission area you will need to get in the SKIP and fly to the C.M.S Brusilov destination choice. When you arrive, exit the vehicle to enter zero gravity mode. Note that you must be playing in co-operative mode in order to play through this mission!

When you exit the SK-1P, look for the large piece of debris below, with the number ‘6’ written on it. Fly down to this and check out the black and yellow windows. These can be shot out. Once of these contains a Weapon Part – Precision Tip [Weapon Part 1/5]. Next, fly around to the bottom of this piece of debris. Shoot the Cysts that you come across here and find the door leading inside.

As you enter, look against the right hand wall for a S.C.A.F Artifact [Artifact 1/2]. Open the big chest at the end for an Upgrade Circuit [Circuit 1/2] and a swathe of ammo and other crafting reagents. As you exit the chest, a lLeaper will spawn behind you. Take it out and exit back to the zero gravity area.

Use your suit locator and fly over to the objective marker. Note that here is a hive mind attached to the piece of debris floating directly opposite the entrance, so kill this if you wish before landing and entering the door.

Once inside, proceed through the next door and enter the room at the far end of the hallway. Here you’ll see a ladder leading down. Wander around the room here and kill all of the wasters that appear before heading down the ladder. At the bottom, you will encounter a Pregnant (remember – shoot the legs, not the body) and a Fodder. There are a good number of lockers and crates to destroy in this area, so go for it if you are in need of ammo or resources.

Continue through the unlocked door and look on the ground to the right for a text log [Log 1/3]. Take the opportunity to refill your oxygen here if you need to as well. Keep going along the set path until you reach a control room of sorts. There is a pair of Fodders in here and a number of lockers for the looting. When ready proceed through the next unlocked door. Enter the lift opposite and ride it down to the next area.

Exit the lift and kill the 2-3 Lurkers in the immediate area, there is another oxygen tank we can use to refill our oxygen here too. When you are ready to go, climb down the ladder. Loot the lockers here if desired and continue around the corner. Here you will find a text log [Log 2/3] and a weapon Part – Explosive Module [Weapon Part 2/5]. Sitting to the left of these is a panel we can use to re-activate oxygen to the ship.

Have one player hack the panel, whilst the other looks back towards here you came from. As soon as the hacking begins, a large number of enemies (well 3 Lurkers and 3 Fodders) will pour out of the vent here, so the non-hacking player will have to defend until the hack is completed. Note there are some stasis and explosive canisters lying around to make things a little easier.

Once oxygen is restored, return back up the ladder and take the elevator back up to the previous area. Once you are up, enter the door to the left for some ammo/med packs/reagents before going back to the hallway, killing the slasher that appears and entering the door opposite.

Enter the door at the end of the short passage; eliminate the 3-4 Fodders here and the check out the door at the end of the first hallway to the left. Go inside and look on the bed for an EarthGov Artifact [Artifact 2/2] (note there is also an upgrade circuit on the desk here in new game +). Return to the main hallway and enter the door at the top of the stairs.

Go up the stairs here to find a hacking puzzle next to a locked door. Ignore this for now and check out the unlocked door nearby. Inside you’ll find a text log [Log 3/3] on the bed and an upgrade circuit [Circuit 2/2] on the sink. Go back outside and complete the mini-game to open the door. Go on through. A scene will play.

After the scene has concluded, you’ll need to defend yourself against a few waves of enemies, 8 Fodders and 3 Lurkers in total. There are some stasis canisters about, so feel free to use those if the numbers start to get a little overwhelming.

When the room is clear, go over to the back left corner and loot the chest here for 3 weapon parts – Plasma Core [Weapon part 3/5], Ammo Support [Weapon part 4/5] and Compact Conic Dispersal [Weapon part 5/5]. There is a bench here if you wish to play around with your weapons (note that behind the marker statue in the centre of the room is a weapon part – Mk-II Compact Conic Dispersal on New Game +). When you are ready, go back through the door we came from.

Kill the Pregnant that is waiting for you on the other side. Note that if you do shoot it incorrectly, it will spawn those swarmers which will go and revive the bodies in the room here. Once everything is dead, enter the door at the bottom of the stairs and follow the hallway to the left.

Enter the door here and kill the 4-5 Foddersthat occupy the space before entering the next door. Return through the door opposite the lift. Kill the 3 Lurkers and 5 Fodders that are now residing here before continuing back through the unlocked door at the bottom of the stairs. Refill your oxygen here if required and then enter the next room. Climb the ladder to the upper area.

As you reach the top, fight off the lurker and 4 Fodders that drop down from the roof in here before continuing through the door to the starting area. Return outside to the zero gravity area to complete the mission.